Henan Wastewater Treatment Plant, Hualong District, Puyang, Henan Province

The Henan wastewater treatment plant is located in Hualong District, Puyang City, within Henan Province, China. It serves a population of around 331,000, classifying it as a medium-to-large agglomeration under Chinese municipal wastewater management. The plant is situated inland, approximately 50 kilometers from the coast, and its operations are part of the broader water infrastructure serving the region. As a facility serving over 300,000 people, the plant is expected to meet China's Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002), which mandates secondary treatment with nutrient removal for plants of this scale. The regulatory framework ensures that treated effluent meets stringent limits for chemical oxygen demand, ammonia nitrogen, and total phosphorus before discharge. The plant's treated effluent likely discharges into a local waterway within the Hai River basin or a tributary of the Yellow River, given the geographic location. The downstream environment includes agricultural areas and eventually flows toward the Bohai Sea. Proper treatment is critical to protect water quality in this densely populated and agriculturally active region.

The plant discharges into a local river system that is part of the Hai River basin or a tributary of the Yellow River, both of which ultimately drain into the Bohai Sea. The downstream environment supports agricultural irrigation and aquatic ecosystems, making effective nutrient removal essential to prevent eutrophication in receiving waters. The region's semi-arid climate and intensive farming increase the importance of maintaining water quality for both human use and ecological health.